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What does -z mean in Bash? [duplicate]
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-z string True if the string is null (an empty string)
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半个汉字的校验与处理(C++) - C/C++ - 清泛网 - 专注C/C++及内核技术
...长度
char *GetTruncate(char *strSrc, int nMaxLen)
{
if (strSrc == NULL || nMaxLen == 0)
{
return NULL;
}
int len = strlen(strSrc);
if (len == 0)
{
return strSrc;
}
int size = len; bool bFlag...
C++中判断文件、目录是否存在的几种方法 - C/C++ - 清泛网 - 专注C/C++及内核技术
...介绍几种方法。
首先关于判断文件的存在性：
一、ifstream
在C++中，可以利用ifstream文件输入流，当我们直接使用ifstream来创建文件输入流的时候，如果文件不存在则流创建失败。
ifstream fin("hello.txt");
if (!fin)
{
std::cout <...
WSAAsyncSelect模型 - C/C++ - 清泛网 - 专注C/C++及内核技术
...始化代码
WSADATA wsaData;
WORD sockVersion = MAKEWORD(2, 2);
if(WSAStartup(sockVersion, &wsaData) != 0)
{
return 0;
}
USHORT nPort=4567;
SOCKET s=socket(AF_INET,SOCK_STREAM,0);
sockaddr_in sin;
sin.sin_family=AF_INET;
sin.sin_port=ntohs(nPort);
sin.sin_addr.S_un.S_addr...
Linux C/C++进程单实例互斥代码分享 - C/C++ - 清泛网 - 专注C/C++及内核技术
...enter_app_singleton() {
int fd = open(kPidFileName, O_RDWR | O_TRUNC);
if (fd == -1) {
//对应的锁文件当前不存在，试图创建该锁文件
fd = creat(kPidFileName, S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH);
if (fd > 0) {
fchmod(fd, S_IRUSR|S_IRUSR|S_IWUSR|S_IRGRP|S...
In Scala, what exactly does 'val a: A = _' (underscore) mean?
...s initialises the variable to a default value. From the Scala Language Specification:
0 if T is Int or one of its subrange types,
0L if T is Long,
0.0f if T is Float,
0.0d if T is Double,
false if T is Boolean,
() if T is Unit,
null for all other types T.
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Last segment of URL in jquery
...21 '11 at 11:18
Frédéric HamidiFrédéric Hamidi
232k3737 gold badges445445 silver badges455455 bronze badges
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PHP PDO returning single row
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Most optimized if you use "LIMIT 1" in your prepare statement.
– mjspier
Mar 28 '11 at 9:06
2
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css overflow - only 1 line of text
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If you want to restrict it to one line, use white-space: nowrap; on the div.
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Why does ReSharper want to use 'var' for everything?
... for everything - I do lots and lots of code reviews using TFS (web based diffs) and it makes my job extremely difficult: i.e. var items = GetSomeItems(); vs IDataReader dr = GetSomeItems(); Missing using statement on both but easier for me to catch when using IDataReader vs var.
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